I found THIS ARTICLE about SBT type and style last night and found it quite interesting. A lot of it just expands on what Housedog said in his recent post.
It also has a couple of photographs of SBT's before the revised standard (click on them to see them fullsize).
Excellent article Graeme, and oh so very true, one of my all time favourite dogs is in the top left picture, second from the left as you look at it, Harry Mellings Tough Guy, to me a true Stafford.